I don't know how convenient they will be but electric cars would make the air in our streets much healthier.

At the moment, tiny diesel particulates called PM10s from traffic fumes penetrate deep into the lungs, which can trigger breathing problems and allergies.

This causes suffering and is costly for the NHS. Asthma rates have risen significantly over recent years.

A small amount of benzene is added to petrol and benzene is a proven cause of cancer. Some British towns are breaking safety regulations on air pollution and the government's own figures state that 24,000 premature deaths a year in the UK are caused by air pollution.